SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceff3030903f3d57885f3cea1fd3f20704dae1db4dc811d1660c21ef3626305b' 
  AND token = '23lK0ejX8CP6ksQSs6U5X/lZP4+jQqp9rQVgqhsv9ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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