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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8454ca6d2399964b3d2f6c79537371e4bd290778b873704447d2293b7b12d6d' 
  AND token = 'pb9KCT4DR43vBI8wc2x6wt/tWXYDJkc5zjkSyt+V9Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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