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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '981266205ceb717ae30ca32c11809e8c4578b46440dbc1cc71705fc0b11981f2' 
  AND token = 'UAXQZj6hHPlsDXIY6vUkprh1WLHaIKp7+y4fvdxE5kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}