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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c30de17b439cb23adc527561420f8c92d2dc8e4a85965d36187dbbcd841180d1' 
  AND token = '57xU2NfGl35I+ZpLZ25UiRNihuuuvGeCDgtdIjoIjrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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