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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27764f0f2d3a5474df07f83f25efb88ac25e3c748186db551c528ad167cc37f4' 
  AND token = 'fRCe9tYIIL8p85k8vkBTcLyoXbONyyIujvwtvWuWVxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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