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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83710d1b07929b0f7d750aa8a3957012525da6f1f53552174cb44fc0a408bef0' 
  AND token = 'm1xMnTpOjg3gbM41RpJidSdY/VX57TwE1+vGx0okETU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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