SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '817d88dd6006e8ca9669e1852d63bd18171094e2393cd9f754b5010475052cc6' 
  AND token = 'HaWeDluYVvv9b7fhctk90/Bnq0Huwk8+gkiWmP9Kq/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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