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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f792082c3101853e0a873686ac6cdbf79e5aa674db182d41f4bb880abdc3d84' 
  AND token = 'shnENQx5AcCMq990VlFTfeR+2bvFYbLcyTpJrCK178U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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