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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acaa69891f8193dd2900783a3cd77772f6ed7f9660ab91a8c2691397124b6492' 
  AND token = 'P+IbtFN2A3IWAWPtW1o9Nzt+XF1xBYUEN98fqzAEZFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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