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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c1ee53dec34baf718417be03b52d05c1c4956c21ce328eb1244e88b5ac5c8ff' 
  AND token = 'iDdGc8/U+48x9KlWG41PMxq+oXG4nZn+RPVsr3MRCN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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