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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6ec5f269e9c2d3f7c8ba2b70c19d571539027473b4a6b203de5b40f7c2a4769' 
  AND token = 'AGD4sVOtwQ4snd5eMppKF6xEcs9qfjB7fo17Ew014AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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