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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fca0d6f3f00c6538ce97f11e771b40dba93d9addbaf5e8b3aeaae1ddb658e262' 
  AND token = 'iHUGi1ypXlo5MxGJaq9+yLfOesVcZ6Q604ZRmdKcXG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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