SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67a8ea283aa273d04ac159225f06d82ff316291005caf0be5be5fff3c3f97301' 
  AND token = 'DhVG2OGG3DWF5TK7Ij+/G0THeOYY3oFwg7fCeH4KkIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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