SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70f79744252056e531c8a64d3acbd60ad48ac5169663c537cf06717823b84c0e' 
  AND token = 'wffkgOjV/eSwIn/MKK8xBmVdHIf2SEyZLGrROFw8ryI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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