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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54923d3c4a6aa0fe321fde0d649b2166b9c8c4183781ad211edaf8356d3843b0' 
  AND token = '+HafJwZ9iuqq9cdwmyc5nn9uuulpEhCbAwoSwSdpxas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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