SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '266094c07d212d0c754ced6dc859c34cb7fd59118694875b07fbf3199bf31047' 
  AND token = 'rUqUg8Kf9wOzX+rub8NH/8TLUla2HxQeSwPNwufB3Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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