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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3dbb22e2f5b36ea89b9e6f120d2381ced67b83f7a2eb47ed3072a87a61eb10d' 
  AND token = '5Gyz7omSg1twCDXrrB8JRpo7Vjp/7CNeO5vnzcfuH8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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