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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94adb124f34661a511d8bddbe15cd154b57a1ec204d967c0e4831c2091b5a400' 
  AND token = 'w22FqYaPA336+9K8Vw9RDoFXz9i99wpomUmQzmNK158=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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