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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0806676faab35970bb171946b5573562437f6903030a28da35e1b705216a7ab' 
  AND token = 'R5gJkQLwJfkZ5iOWPrmUVYO2JKAmp8PX6kEzNtNFLkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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