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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9aed8bce2a452f5511196922b3acf2773ff3941c89e216ae42617e6a93d9208' 
  AND token = 's8DSONO26rVpiUIWCCvAX/uKP0RiARsr9qtM2zQxVY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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