SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1ef89b35952f61966fcf65a18e4b7850090e22cfd56b7b7de173298078fe1b5' 
  AND token = 'ovGrOaUJBPrBpmtpqZE72bsOgTcfpVdZXaTKIgQtLqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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