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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e71184507468acb57643dd79d53ab8ac33895af7acc7dddf9f7ab0c9dbd55270' 
  AND token = '/jf9XrmNMlK9cG2TPOpEBdj5QFBjBBmUQs+OGEkPpFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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