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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b8fec882e772e47d3e6695b872c5a7b4cff34b29ce45a4e8fb3d9b1e7e7579e' 
  AND token = 'ta3iExy+9ZAHu2WWyXJdjkCj4xz2Kw0S9mp1pWQAS78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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