Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8300d1686c90e29001b8c6da2ceb44cbb15c7d0906eb28225bf87a0f4260b6b' 
  AND token = '//RlDHOyHuiOUsxNsGjMxkNe2Z/NJhO/fla79H0IM7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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