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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c997d299fa12718991a82d8834417442e90c153230a646fb4c3ce013bd54a393' 
  AND token = 'iG9Vyvs91BWfztpdTqOT3ymWpSUWA1ltkgLkO7obmn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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