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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24be45570d5c3ff63ab3b41d9393447dce41cb1bf5f4ab963d2fa775682a6654' 
  AND token = '3toM4wOcwLqAyXscgW9472rMttAnteMiWL+m04D4UA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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