SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e9553d655291c2da0977076ccc649e582551fbe02752431141915425dd929db' 
  AND token = 'cjmKmHYCJzX8ZW8Nkw23lCFqmUpgM2z5PH5X4hi4ybI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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