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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b4fe9630d97a290765931e962d9e123ca10f4dfba336d72e9be87e195616048' 
  AND token = 'b2q97Uwc6PvrEJ9FbHtbhS8d9sJqDU9GcHf7ATr+Qt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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