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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6bb5dcfb821085c368c24d4e384ed35237e6726fcd4e77cb05e21165a9cd385' 
  AND token = 'anMeuiyDtS1wTfrJbzAkU78ZHbuiaTkMykQeiXtdH/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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