SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22d99c811d1f930e126f4653a123921c4b8592d8389b3f740a5149a783cc9a19' 
  AND token = 'HJUKnPGozplknVloPEAM0/izQjMvg7PrKayvoQYhx28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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