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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a115169c9a18b8e435e02bb5f7460db804ec33885cab4d781787b6c965cd3806' 
  AND token = 'MDfsf+Y7IfEviiwSZ/EKO3YM+KtPpp7tpDkF8Rc9FEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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