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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fe3de46fef8f3e7d398058d6cbfd3a773828e154d241833e5813602a17e1947' 
  AND token = 'LRvhNnRuGCpjfgsY0XXeJIcgmHqkSs97JcOkrMiTXA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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