SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7d5eeb7df55726083d1a9fa92593aa60f619759734ea292c1a5a70cac7e10bf' 
  AND token = 'GBiu4z4mYETgIHwYAiFsm3KcVmAM4yyvWmbfJCld5zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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