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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1875060dbf07dc47fafda1bae7a8ffc8e834b2fc7644f57ef409a8d92c9b58ad' 
  AND token = 'LhRWsIQxRomRPhS3imbbKUHXR6fbyJy+G5qEZoXaXyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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