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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2059b0ff1749c0181bfeeac9a78fe5c205095ced20a5a314fba184c0c46e8b8' 
  AND token = 'NahKmxxJyt21qhyf33vZv/tAAcjlUZ5D1OjRs2wlVno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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