SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd30b62c21631ffc190f7312357901f0fa5f4c826285688c39ea50f1eb872ae2a' 
  AND token = 'UbpvHxBvE+f7MMRwR5LJAf/lUR6TIQ5cr7wn8PzBGGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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