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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afee4f3062ca82f67773464d36575330fa13066918cd27d8692daa136b7d713b' 
  AND token = 'jFSofIrcU0UT+xXD2Puhk5kNKb3hd5Fv9UQjXVM0WLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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