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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '904ed374ed9c6b6dad3061f89e9eba5d742fb2456fed87712807370496f64a89' 
  AND token = 'pHRff2QgoNyBYyoTTm62PsubDwg5nkIuxuybzY/SkOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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