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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcdfb3012b5e838ede33b02a7b16c91d549fd92c8e8de3421c56af7d7620f922' 
  AND token = 'b5IW98NJUEewEhqEugbML8rcBBNOHMPsS/MB1BqzWms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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