SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf0cafd9d4571a819bd5874888e7ea828a896aa7a466ec39f9f76303a27d053f' 
  AND token = 'mVGB0yqmdIjSPzBbVQiXNBWzWi/Y43KDxQ4z61zRB2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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