SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f593b6257ac9a8f4c7ad316de892f44a9598ca1caf5f5c508e83a9fd6b60302' 
  AND token = '+JGuVMnDhUSzNP22J90Kg7YoIWE4Nu+q0H/WGjzdO5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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