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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39518de4c14663f7afc1145cd9ae0552cf492fd466848b9858e439ea54e4ccc6' 
  AND token = 'JmE7CQTg98BbbVZ8g1kvCKSRbjO2wm3iwEASCygFFXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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