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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8847dd35f6761e44f40f6e016bd5879ccbc3dd054af1c7ea8a1853fe28153460' 
  AND token = 'u5sDBxkhuH8Kkbz/8oX/syeoBKe7Dtkik0JzhIZ6Jw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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