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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66dbc773469fcf025f7c9009a343b7508201e24f01ca68ea7a9ae97c615ec1eb' 
  AND token = 'sz6lxFta2VX4mnAyltdaHQTn0a+eAssaWnXHT9Xweic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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