SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc2f3f4bd2c8ddb37da4caa5ac5cf064c46ade29e522bc387e818123a3aafbde' 
  AND token = 'XeKOl6naubLvCP5w+UayjRGz/1IxQ/WO1gYnv9kwVts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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