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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '299b22ad99b6cc02572e35c932e5d8446d91c8b90a72e3e6a9b0f78dce5e9d3b' 
  AND token = 'irTvQmOYiGxK2KVmeILoeWwQlnLOyJ3p6p3LCx/5Xkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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