SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cb7839dfd9b39453ed98f69ae894f637784df32c32b2d9d3f3611b45212161e' 
  AND token = 'h/50HMqHIRzO+kQy01Gitzbu+M3qE3mpflGSZOBYLDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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