SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8831aed2f4c8756e50f80340ef3ead84f0a4f3cbfb1e8a7b793199f5d060e89' 
  AND token = 'bhc/ABMfpA/8s+MYtw+JILla/P2s8xHuraLgqJQV9AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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