SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f082945f4e1694a7f1e1eee803d9762e50ddad2586da85618b45b4a07087bded' 
  AND token = 'GcMTmn5KLq+RQfzF3K1hXeFkEZXMgJr4lFM3OgejOm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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