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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '665925671c551eba0b3addeead5eb4dc1ed0e4d1f94fcc6399d9a014e7b5cf69' 
  AND token = 'f4ml/6J2BScbSAd9TWYGSY/RY5tPFvZbEHIN3sJN37Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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