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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7265897c66e0cfcc52389597f69eced3586009d673816a3e0093f349ea85901f' 
  AND token = 'IwOTaIrzRLv++K/WDNfXSFBuTMk7EteKuVOh+pFJXO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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