SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4619faf4a1f2aaf26c19c2f23de28fec683b31bce9466827d2b4f61ff182c94e' 
  AND token = '0k+PKWmz20huvSN9/0h6uY7ouBTH/eOJ7lJjBj14lBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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