SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6adc58c5737d9aa93b86a6e3263410f295138cdf252f899288fc5786d6a19e05' 
  AND token = 'TgqEIqgTYxLBMKV6CJZIkXf+YRDZ9r9MX0UNqmk6Nw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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