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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eed816c541daf631ade1066f360b3667a1a51cd48cb6ac9f96696ae76a1b7856' 
  AND token = 'PxOjK/WEy8JoGwND6QTvlwJuWIvF9+O+E/pOL4Ygczw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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