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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2bf267906963ab00a1bee20e70f838243a8f78e78b96b3cbb89f9403c11f463' 
  AND token = 'xbqUi85P85GBoE/M9wE5xA8kxRVBb0PRZ36MV/7ctI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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