SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9490fa9124b3ff2e0365d4beb686977c35fc99667347d924e5604d9a23637a9' 
  AND token = 'FFJGqdq7PIPQ2nsXYfemgy75YhnlTgKUuG5bfMk1aL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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