SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27b5653ead88e09b3daf134a2fb506d94c30f931151a347c3df268d85dc927b3' 
  AND token = 'SZWQTt4XZqZ1/7CaUOw9rLKzNkwZM5aquJx5OOF/dmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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