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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39914db75a9eda4f4f10b61b06e9d052e059f7873f729c1295af5f258b87b24f' 
  AND token = '4Og/T+nirTDgwR8CAH4cUJh0nirvEbm0vK1bSEyneIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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