SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8132ce5d7ce2bc1b08817b1839545077fc560d10773460171f19c44c25faed6' 
  AND token = 'rcPwDl+uXt3QUELGSswpbdzjtVya96IZSJcxCMF3/e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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