SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba5a02a94b90caf8fb8695ed45c178ac77f19bac4cd39fa865ac700b98d6c43e' 
  AND token = '555lSJVk0vFwTbkOOQlAz/BspIKpVlAGoVvmD2YNfgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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