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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d517b83c88e5437c9d016b70b554ec7fe8898907e995ddc7fb59ffdf6350714' 
  AND token = '2W8oxrGSEizldscn+oMWAvMQXISTV9qdDdwgA/I5JDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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