SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bcf92d0028ac554332dc04ff97b67cf079248ac6377b2653763d8d1d5a34dba' 
  AND token = '0EXp3/D2whXNMZPI5GabHJxYlZ6ormzX9Ij4GcMCuNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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