SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '327969730756eddeec3d93ab11f8894d9edc13bd3fff8b86e42cabf8ec2839cb' 
  AND token = 'reLnkSKqI7VGU8BOLBLaqB3THD4NJj4hwLCZjh756DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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